Shiranuka Formation - Kushiro coal field, eastern Hokkaido (Pliocene of Japan)

Where: Japan (43.0° N, 144.1° E: paleocoordinates 43.1° N, 143.5° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Shiranuka Formation, Early/Lower Pliocene (5.3 - 3.6 Ma)

• STRATIGRAPHIC RELATIONS: From Shiranuka Fm of the Atsunai Gp, which overlies the Atsunai Fm of the Atsunai Gp (Middle Miocene) and is overlain by Pleistocene terraces. THICKNESS: >350 m thick. AGE: Early Pliocene on the basis of molluscan biostratigraphy. STRATIGRAPHIC POSITION: Composite checklist for formation.

• formation-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified sandstone and poorly lithified siltstone

• ENVIRONMENT: Coastal marine, siliciclastic environment.
• SPECIFIC LITHOLOGY: Sandstone, siltstone, and tuff. LITHIFICATION: Assumed to be poorly-lithifed on the basis of age.

Size class: macrofossils

Collection methods: COLLECTOR: Presumably Y. Honda (c. 1984) and Suni and Yamaguchi (c. 1969). REPOSITORY: Uknown repository.

Primary reference: Y. Honda. 1989. Paleogene molluscan faunas from the Kushiro Coal Field, Eastern Hokkaido. Tohoku University, Science Report, 2nd series 60(1):1-137 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 70598: authorized by Austin Hendy, entered by Austin Hendy on 29.03.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda, bivalvia and scaphopoda. NOMENCLATURE: Authoritative publication, using moderately recent nomenclature, subgenus and species level designations.
Gastropoda
 Neogastropoda - Buccinidae
Buccinidae indet. Rafinesque 1815 true whelk
Bivalvia
 Cardiida - Cardiidae
Clinocardium sp. Keen 1936 cockle
 Cardiida - Tellinidae
Macoma (Macoma) calcarea Gmelin 1792 tellin clam
 Pholadida - Myidae
Mya (Mya) cuneiformis Bohm 1915 softshell clam
 Nuculanida - Sareptidae
 Nuculanida - Nuculanidae
Nuculana sp. Link 1807 pointed nut clam
 Nuculanida - Yoldiidae
Yoldia sp. Möller 1842 clam